_Simia beelzebul_, Linn., Syst. Nat., i., p. 37 (1766).
_Mycetes rufimanus_, Kuhl, Beitr. Zool., p. 31 (1820).
_Mycetes discolor_, Spix, Sim. et Vespert., Bras., p. 48, pi. xxxiv.
(1823).
_? Colobus chrysurus_, Gray, Ann. Nat. Hist., xvii., p. 77 (1866).
_Mycetes beelzebul_, Gray, Cat. Monkeys Brit. Mus., p. 41 (1870); Schl.,
Mus. Pays Bas, p. 150 (1876).
CHARACTERS.--Black, slightly washed with yellow on the under side of the
body and inner side of the limbs; hairs of the body soft, brown at the
roots, black at the tips; hands and feet variable, reddish-yellow or
reddish-brown, or grey, or black. Upper surface and tip of the tail, spot
in front of the ears, and on the knees, reddish-yellow. Length of the body,
17½ inches; tail, 18½ inches.
This species differs from the Black Howler (_A. nigra_) by the {198}brown
colour of the roots of the hair; and from the species next to be
described--the Brown Howler (_A. ursina_)--by the length of the fur and the
absence of the reddish-brown tips to the hairs.
DISTRIBUTION.--Apparently confined to the Lower Amazon, in the vicinity of
Para.
HABITS.--The same as those of the species already described.